PHYSICS

Mechanics
Sf-unit Additional
Quantity Symbol legal units
(name)
Mass kg (kilo­ g (gram)
gram) t (ton)
u (atomic
mass unit)
Moment kg-ml
of inertia
Force N
(newton)
Pressure N/ml bar (bar)
rnmHg
(millimeter
mercury)
atm (atmosphere)
psi (poundforce
per
square inch)
Energy, J (joule) kW·hour
work
(kilowattthour)
eV (electron
volt)
Power W(watt)
Density kglm3
Conversion
I g= 10-3kg
It=103kg
I u = 1,6605402·10-Z7 kg
I N = I kg-m/s?
I N= 10 5 dyne
l lb = 4.448 N
I dyne = 10-5 N
I atm = 1,01325·10 5 Pa =
=1013,25 mbar = 760 rnm Hg;
I mbar = 100 Pa = I hPa =
= 0,75006 mm Hg;
I mm Hg = I torr = 1,3332 mbar =
= 133,32 Pa;
IPa = 9,87·10 --{j atm = 7,5·10 -3mm Hg.
I psi = I lbf/in? = 6894.74 Pa.
I J = 10 7 ergs
1 kWh = 3.60.10 6 J
I cal = 4.186J
I eV = 1.6.10- 19 J
I hp = 0.746 kW
I
Electricity and Magnetism
Quantity
SI-unit Additional Conversion
Symbol legal units
(name)
EI. current A (ampere)
EI. charge C (coulomb) 1 C = 1 A·s
EI. voltage V (volt) 1 V = 1 W/A
EI. resistance g (ohm) lQ=lV/A
EI. conductivity S (siemens) I S = lIQ
Capacitance F (farad) I F= 1 CN
Magnetic flux Wb (weber) 1 Wb = I v« = I W'slA
Magnetic flux T (tesla) G (gauss) I T = 10 4 G
density 1 T = 1 Wb/m 2
Inductance H (henry) 1 H = 1 Wb/A
Magnetic Field Aim Oe (oersted) 1 Oe = 79,5775 Nm
Strenzth
Optics
Sf-unit Additional legal units Conversion
Quantity Symbol
(name)
Luminous cd (candela) IK (international I NK = 1,019 cd
intensity candle) INK=lcd
NK (new candle)
sb (stilb)
1 sb = I()4 cd/m?
asb (apostilb) I asb :::(lin) cd/m-
La (lambert) 1 La :::(lin)10 4 cd/rn- fla
fla (footlambert) I fla = 3,426 cd/m?
Luminance cdlm 2
Luminous 1m (lumen)
flux
Illuminance Ix (lux) fc (footcandle) I fc = 10.76 Ix
186
187